Explain the impact of Greco-Roman classicism on the art and architecture of the Renaissance

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The period of the Renaissance was based on a backward-looking scholarly movement, which built upon old classical texts and artistic models from ancient Greece and Rome. This movement, known as Classical humanism, became the foundation from which all the Renaissance artists built upon. Perhaps most importantly, the Classical principles of symmetry and proportion influenced all Renaissance arts, from painting, to sculpture, to architecture and music.
For example, the revitalization of the nude in Renaissance art reflects the classical attention to correct anatomical proportions and contrapposto stance. Donatello's David was inspired by the classical statuaries of Rome, for instance, where he studied. The gently detailed proportions of Renaissance nudes stood in stark contrast to the medieval representations of the human body as a vehicle for sin; instead, the Renaissance nude praised the body as an object of pleasure.